Some entrepreneurs who have made billions off of their tech ventures like to spend them in some pretty extravagant ways, whether it be on private planes, summer homes, or even an entire island.

Others turn to more-philanthropic efforts, choosing to donate their wealth to different causes through foundations and trusts.

We've rounded up some of the most generous people in tech, all of which have decided to donate large portions of their wealth to charity rather than pass it down to their children.

Microsoft cofounder Bill Gates

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Gates has been open about his decision not to leave his $78 billion fortune to his three children. They will reportedly inherit just a small slice, about $10 million each.

"I definitely think leaving kids massive amounts of money is not a favor to them," he said in a Reddit AMA in February.

He founded the Bill & Melinda Gates Foundation in 1994, and it currently has more than $36 billion in assets. Gates also teamed up with longtime friend Warren Buffett to start a campaign called "The Giving Pledge," which encourages other billionaires to donate at least half of their fortune to charity.

AOL cofounder Steve Case

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Case helped millions of Americans get online, and now he's donating much of his wealth to developing other technologies.

He founded the Case Foundation in 1997, which focuses on using technology to make philanthropy more effective. He also started an investment firm called Revolution, which invests in startups outside of Silicon Valley, and signed the Giving Pledge.

"We share the view that those to whom much is given, much is expected. We realize we have been given a unique platform and opportunity, and we are committed to doing the best we can with it," he and wife Jean wrote. "We do not believe our assets are 'ours' but rather we try to be the responsible stewards of these resources."

"In 2001, I publicly stated that we intend to give away the vast majority of our wealth during our lifetime," the couple said in their pledge letter. "Our view is fairly simple. We have more money than our family will ever need. There’s no need to hold onto it when it can be put to use today, to help solve some of the world’s most intractable problems."

They've also donated eBay shares to the Omidyar Network, their philanthropic investment firm, and are the single biggest private donors in the fight against human trafficking.

"We are pleased to be a part of the Giving Pledge not only because we are able to commit these funds, but because we believe they can lead to real learning and measurable change," they said.

Tesla CEO Elon Musk

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Musk may have five young boys from his first marriage — one set of twins and one set of triplets — but he's already donated much of his fortune to renewable energy, science and engineering education, and pediatric health.

Google CEO Larry Page

Page, on the other hand, has a somewhat unique idea for what he would like to happen to his wealth.

In March, he told Charlie Rose that instead of giving his billions to his two children, he would rather give it to entrepreneurs like Elon Musk, who are coming up with big ideas to change the world.

"[Musk] wants to go to Mars. That’s a worthy goal," he said. "We have a lot of employees at Google who’ve become pretty wealthy. You’re working because you want to change the world and make it better; if the company you work for is worthy of your time, why not your money as well? We just don’t think about that. I’d like for us to help out more than we are."

Now see some tech titans who spend their money in more extravagant ways.